The default value of the RadMenuButtonItem.TextImageRelation property was ImageBeforeText until Q3 2014 after which it has changed to Overlay.
We have just issued a new release - Q3 2014 2014.3.1104, which covers this issue and couple more issues important for our customers. For complete list of changes, please refer to our Release Notes (http://www.telerik.com/support/whats-new/winforms/release-history/ui-for-winforms-q3-2014-(version-2014.3.1104)).